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Global Connectivity in IP Networks
2011 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Modern humans like freedom, both in thought and movement. Modern humans are also oftenconnected to internet. But those connections aren’t as free as the humans themselves. Wirelessmakes it easier to obtain this freedom. But in traditionally wireless networks you are only ableto move inside the radio coverage of the access points. I will make an analogy and liken thisto an animal at a zoo. The animal has its cage and will not be able to move outside its borders.To widen the habitat the cage doors needs to open and a key is required. The key is mobile IPbut the key has its limitation. To move between networks, using mobile IP, it must close theconnection before it can open a new. Just as if the animal had to unlock and lock the door atevery passage.Good enough?Might be!But the modern human like no borders or at least doesn’t want to note them, the handoversbetween networks should be seamless. Multi Homed Mobile IP is a solution. It allows you tohave several connections at the same time but you are only using one for traffic. This gives apossibility to change connections for the traffic without the overhead. It will be, in a way, justlike if the animal was both inside and outside the cage in the same time. Thus the door is openit can freely move and its habitat been larger.Now let’s continue the cage analogy but in a different way. We have the animal we have thecage and the cage has several openings where the animal keeper brings the food. We havealso got one food supply from where the food is brought and several roads from that supply tothe different openings.In our analogy the food is our network traffic, the cage openings are mobile IP ForeignAgents through which the traffic are maintained. The food supply is the mobile IP HomeAgent with whom the mobile IP Mobile Host are registered and via all traffic goes and theroads are the networks between the Home Agent and the Foreign Agents. The fact we’ve gotseveral cage openings is what makes this Multi Homed Mobile IP.The animal wants his food as fast as possible and has to decide which opening should be used.But the only thing he can see is how big these openings are. This is just the way WLAN doesit uses Signal to Noise Ratio which only give the signal strength and nothing else. Thus ouranimal doesn’t know anything about how crowded the openings are or the condition on theroads from the supply. Even if he chooses the biggest hole he can’t be sure to get any food atall. He needs something else that can tell him about the best route to choose for his food.The same are for Multi Homed Mobile IP, new metrics are needed.Christer Åhlund has in his Doctoral Thesis “Extended Mobile IP and support for GlobalConnectivity in Hybrid Networks” proposed a Running Variance Metric and a RelativeNetwork Load as performance metrics. He has also done simulations which show how thesemetrics perform.This Bachelor’s Thesis evaluates these metrics in a real environment and compares the resultsagainst the simulated ones.The result is that the metrics will serve fine in handover decisions. I’ve also made proposals tochanges in the Running Variance Metric algorithm. These changes are to improve theperformance.The results has also been used in Robert Brännströms Doctoral Thesis Mobility Managementin Heterogeneous Access Networks

Place, publisher, year, edition, pages
2011. , 44 p.
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-47984Local ID: 5789423b-d4df-4f87-b866-eeb2561bf12aOAI: diva2:1021321
Subject / course
Student thesis, at least 15 credits
Educational program
Computer Engineering, bachelor's level
Validerat; 20110107 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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